Hi !
This is using worker rather than prefork - apache 2.2.6 as comes with
fedora 7. I've changed /usr/sbin/httpd to be /usr/sbin/httpd.worker.
If I make a 1000 requests with ab with keep alive to apache - eg
ab -k -n 1000 <url>
then I get alot of connections from apache to tomcat that are in
TIME_WAIT - eg
tcp 0 0 127.0.0.1:46284 127.0.0.1:8009
TIME_WAIT
tcp 0 0 127.0.0.1:46374 127.0.0.1:8009
TIME_WAIT
tcp 0 0 127.0.0.1:46306 127.0.0.1:8009
TIME_WAIT
tcp 0 0 127.0.0.1:46396 127.0.0.1:8009
TIME_WAIT
the counts look like
1 LISTEN
2 ESTABLISHED
999 TIME_WAIT
ie 999 connections in TIME_WAIT
Is there anyway to tell Apache to keep the connections alive for a more
connections ?
Apache config is :
ProxyPass / balancer://myclusterclear/ stickysession=JSESSIONID|
jsessionid
<Proxy balancer://myclusterclear>
BalancerMember ajp://localhost:8009 route=server1 min=0
smax=1000 max=1000 keepalive=On
</Proxy>
Tomcat is
<Connector executor="tomcatThreadPool" port="8009" secure="false"
protocol="AJP/1.3" enableLookups="false" proxyPort="80"
redirectPort="443" maxKeepAliveRequests="2000" tcpNoDelay="true"
keepAliveTimeout="10000" connectionTimeout="600000"/>
If I increase the concurrency to 10 from 1 and re-run the same 1,000
tests I get
1 LISTEN
20 ESTABLISHED
990 TIME_WAIT
Slightly better but i'd have liked to see there be more ESTABLISHED
connections.
Running with 30 concurrency i get
1 LISTEN
60 ESTABLISHED
970 TIME_WAIT
With 50 concurrency I get
1 LISTEN
28 CLOSE_WAIT
28 FIN_WAIT2
66 ESTABLISHED
939 TIME_WAIT
In each case the netstat is performed immediately after the test has
finished and before each test run the netstat only has the 1 listen
socket for 8009. In each case the netstat is from apache to tomcat
So any ideas why tomcat would close the connections ?
Many thanks
David
On Mon, 2007-11-19 at 15:07 +0100, Rainer Jung wrote:
> Hi David,
>
> TIME_WAIT is a normal TCP state after a connection was successfully
> closed. Only one side of the connection goes into TIME_WAIT, namely the
> side that sent the first FIN.
>
> So since you've got httpd and Tomcat on the same server, you first need
> to find out, which side of the conection is in TIME_WAIT. In netstat,
> usually the left hand IP:PORT is the local side, and the right IP:PORT
> the remote side. In case the left pair of the TIME_WAIT line includes
> the port 8009, this would mean, that Tomcat closed the connection first,
> in case 8009 is on the right side, it would mean, that Apache httpd
> closed the connection first. Maybe you could show us some of the
> TIME_WAIT netstat lines.
>
> Both could be OK, so we could ask ourselves, if we expect such
> behaviour. In general AJP connections should be used persistently and
> only closed, if they have been idle for to long.
>
> Is the number of TIME_WAIT connections much larger, than the concurrency
> ("-c") used with ab?
>
> Regards,
>
> Rainer
>
> David Cassidy wrote:
> > Guys,
> >
> > I'm using mod_proxy in apache 2.2.6 with the ajp connector in tomcat.
> >
> > apache config
> > -----------------
> > <Proxy balancer://myclusterclear>
> > BalancerMember ajp://localhost:8009 route=server1 min=0
> > smax=1000 max=1000 keepalive=On
> > </Proxy>
> > ProxyPass // balancer://myclusterclear/
> > stickysession=JSESSIONID|jsessionid
> >
> >
> > Tomcat config (Using the native apr libs)
> >
> > <Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
> > maxThreads="150" minSpareThreads="4"/>
> >
> > <Connector executor="tomcatThreadPool" port="8009" secure="false"
> > protocol="AJP/1.3" enableLookups="false" proxyPort="80"
> > redirectPort="443" maxKeepAliveRequests="2000" tcpNoDelay="true"
> > keepAliveTimeout="10000" connectionTimeout="600000"/>
> >
> > After running a few hits with ab to give it some load
> > there are a very large number of connections between apache and tomcat
> > in a TIME_WAIT status.
> >
> > Is this a common happening ? Is there something that can be configured
> > to prevent this from appearing ?
> >
> > Thanks
> >
> > David
>
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